const jwt = require('jsonwebtoken');
const http2 = require('http2');
const fs = require('fs');

/*
Read p8 file. Assumes p8 file to be in same directory
*/
const key = fs.readFileSync(__dirname + "/{your p8 filename}.p8", 'utf8')

//"iat" should not be older than 1 hr from current time or will get rejected
const token = jwt.sign(
    {
        iss: "{your team ID}", //"team ID" of your developer account
        iat: 1588152436 //Replace with current unix epoch time [Not in milliseconds, frustated me :D]
    },
    key,
    {
        header: {
            alg: "ES256",
            kid: "{key ID of your p8 file}", //issuer key which is "key ID" of your p8 file
        }
    }
)

/* 
  Use 'https://api.push.apple.com' for production build
*/

host = 'https://api.sandbox.push.apple.com'
path = '/3/device/{you device token}'

const client = http2.connect(host);

client.on('error', (err) => console.error(err));

body = {
    "aps": {
        "alert": "hello",
        "content-available": 1
    }
}

headers = {
    ':method': 'POST',
    'apns-topic': 'com.xxxxxx.xxxxxxx', //your application bundle ID
    ':scheme': 'https',
    ':path': path,
    'authorization': `bearer ${token}`
}

const request = client.request(headers);

request.on('response', (headers, flags) => {
    for (const name in headers) {
        console.log(`${name}: ${headers[name]}`);
    }
});

request.setEncoding('utf8');
let data = ''
request.on('data', (chunk) => { data += chunk; });
request.write(JSON.stringify(body))
request.on('end', () => {
    console.log(`\n${data}`);
    client.close();
});
request.end();